Space heater



FIG. 1 is a top, front and right side perspective view of a space heater, showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a partial enlarged view of FIG. 1 .

The dot-dash broken lines in FIGS. 1 and 8 represent boundaries of the enlarged portion and form no part of the claimed design. 

CLAIM The ornamental design for a space heater, substantially as shown and described. 